Abstract

An ecological dynamic model based onphosphorus cycling of ecosystem was developed for Hanshiqaiowetland in North China. The state variables include dissolvedinorganic phosphorus (P), duckweed (FP), submerged plant(SP), phytoplankton (A), zooplankton (Z), detritus (D) anddissolved inorganic phosphorus in pore water (PPP). In thisstudy, a sub-model of duckweed was developed and integratedwith other sub-models of submerged plants and phytoplanktoninto one comprehensive model. This model was calibrated andvalidated based on the data of three types of water areas withdifferent ecological conditions. The simulation value andobservation value agree well. This model is then used toevaluate the effects of ecological restoration methods. Threeecological restoration methods were set to predict the trend of Pconcentrations following the change of controlling methods forduckweed. We should harvest all duckweed before August andintroduce duckweed into wetland after August to achieve bettereffect of ecological restoration. The model provides theoreticalguidance and technical support for wetland ecologicalrestoration.